#!/usr/bin/python
# -*- coding: utf-8 -*-
#===============================================================================
# Copyright 2011 zod.yslin
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# 
# Author: zod.yslin
# Email: 
# File Name: substring.py
# Description: 
#   s[i]        i‘th item of s, origin 0    
#   s[i:j]      slice of s from i to j  
#   s[i:j:k]    slice of s from i to j with step k
# Edit History: 
#   2011-08-13    File created.
#===============================================================================
#      0123456
print("abcdefg"[0])       # a
print("abcdefg"[1:2])     # b
print("abcdefg"[0:7:2])   # aceg

print("abcdefg"[-1])      # g
print("abcdefg"[-7:-1])   # abcdef
